Well, I feel if you nerfed the push on Tolchok it would remove it's gimick and usefulness. While I don't believe it should have high damage at all, I even think it should have the lowest damage of all his weapons, it shouldn't have it's push nerfed. The push is strong, but if doesn't kill fast the target, being a player, can potentially dodge out of it and have time to do so. If you nerf the push it will just be like Kuzmans new gun, and no one uses it because the push is really not consistent enough or useful enough.
Maybe it needs more damage nerf? Maybe also add more rev up time for it to spin to make it so that there is huge sacrifice to stealth and healing for those who want to use it? But don't ruin it's main feature.
EDIT: Also, Draco, look at Iune's Sigh now. With her recharge card buffed anyone who has the rare version pretty much has Tolchok. I stun lock people all the time with her, it's a very powerful gun. She's squishy and has no offensive special power, so I guess it's balanced? But Konstantin is, I admit, more durable with a more dangerous special.